13 permitting authorities may continue to apply SILs for PM2.5 to support a PSD permitting

14 decision, but permitting authorities should take care to ensure that SILs are not used in a manner

15 that is inconsistent with the requirements of Section 165(a)(3) of the CAA. This document

16 provides some preliminary guidance on how to use SILs for PM2.5 in a manner consistent with

17 the CAA.

II.1 1 Significant Emissions Rate

2 The EPA promulgated SERs for PM2.5 and for the PM2.5 precursors, nitrogen oxide (NOx)

3 and sulfur dioxide (SO2), in 2008 as part of the first phase of PSD amendments to address PM2.5.

4 8 (74 FR 28321 at 28333). The PM2.5 SER for direct emissions of primary PM2.5, defined as 10

5 tons per year (tpy) of direct PM2.5 emissions, and the PM2.5 precursor SERs, defined as 40 tpy of

6 NOx and/or 40 tpy of SO2, are used to determine whether any proposed new major stationary

7 source or major modification will emit sufficient amounts of direct PM2.5 and/or PM2.5

8 precursors, i.e. equal to or above the respective SER, to require review under the PSD program.

 

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